I went to every other day and stayed at the same time interval. I did notice some burning the first day. Kansas clay, all rotors, all on slopes. We are having cool overnight temps with days only in the 70's so that is why I made the change so quickly. I want to go to watering every 3rd day soon. Since we are having a dry spring/summer they are going to put restrictions on soon. I used a rain gauge last night (first time)and recorded a ¼ inch for zone one. Will do the other zones soon.

Well it also depends on run off. If the area is at a slight angle, all the water is going to flood off the yard- in this situation shorter run times but more cycles are adequate. There are too many components in a given sprinkler zone to accurately estimate the pressure loss over a given amount of time. For residential properties it is usually not needed anyways. If one was going to install a 150 mile pipeline for oil or gas, the hydraulic calculations would then be needed..

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